Нужно написать 10-15 предложений на тему: зачем я изучаю язык

There so many reasons to learn English. If you ask me, I learn English because it's a very popular and useful language. It can help me in different ways.
First of all, it's a great way of communicating with foreigners and making new friends.
Secondly, English gives me an opportunity to travel all over the world without straggling to read signs or talking to people.
Third reason why I learn English is I want to watch movies in English in original, it's so much more interesting like that.
And one more reason: learning English makes me smarter, more intelligent and even better at my mother tongue.

Why do I learn English?

English is spoken practically all over over the world. People from Great Britain, the United States of America, Canada, Australia and New Zeland use English as their mother tongue. And in many countries English is a second official language. 
The main reason of why I learn English is because it's very interesting to communicate with people all around the world,  to make a lot of friends and learn more about their lives and cities they live. And also knowing english lets me to read books in original, listen to lots of music, watch satellite TV Programs.
English is very important language, especially for people who travel.